Double-walled vessel.



R. BURGER. DOUBLE WALLED vBssELi PATENTBD APR. 14, 1903 APPLICATION FILED 001'. 4.1907.

UNITED STATES PA ITENT OFFICE.

REINHOLD BURGER, OF BERLIN, GERLIANY, ASSIGNOH TO AMERICAN THERMOS BOTTLE COMPANY, OF NEW YORK, N. Y., A. CORPORATION OF MAINE.

lDOUBLE-WALLED VESSEL.

Specification of Letters Patent.

Patented April 14, 1908.

To all whom it may concern:

Be it known that I, RErNnoLn BURGER, a subject of the German Empire, and resident of Berlin, Germany, have invented a new and useful Improvement in Double-Walled Vessols, of which the following is a specification.

This invention relates to vacuum insulated vessels and has for its object to provide a novel device for spacing the inner and outer portions of .the vessel apart at a distance from the mouth of the vessel so that the vessel may be reinforcedat such point by the said device and thus reduce the liability of he vessel to become cracked or broken.

A further object is to provide a device of the above character in which a horizontally arranged ring is located in the space between the vertical walls of the ihner and outer portions of the vessel, said ring having spacing blocks thereon of yielding non-conducting material, the said yielding blocks being compressed between the vertical walls of the innor and outer portions, so that they will be held pcrmanentlyin position by friction only and without special holding means provided therefor either on the walls of the inner or outer portions or otherwise.

A practical cmbodnnent of my invention is representoi'l in the accompanying drawings,

n' which Figure 1 represents a vacuum msulated vessel with my improved spacing device applied thereto, Fig. 3 is a transverse section taken in the plane of the line A-A of Fig. 1, looking inthe direction of the arrows, and Fig 3 is a view in perspective of the spacing device.

The mouth of the "essel is denoted by 1, its inner portion by 2 and its outerportion by 3. The space 4, between the inner and outer portions of the vessel has the air exhausted therefrom to a greater or lesser degree. thus forming a rarefied space between the said inner and outer portionsfor preventing, the rapid change of temperature in the contents of the vessel. tions of the vessel are connected at the mouth thereof and are spaced apart at a distance therefrom to revent undue vibrations in the inner-wall oi the vessel which would tend to crack or break thesame, by my improved device, wh1ch devicc, m the present. instance, comprises a ring 5 oi fine wire,

'lhcse inner and outer porwhich encircles the inner wall of the vessel and is spaced from both the inner and outer walls by a plurality of yielding blocks 6 of non-conducting material, such,for instance, as asbestos, which blocks are compressed between the vertical walls of the inner and outer portions of the vessel with sufficient friction to hold the device in the position in which it is placed within the vessel, without the provision of supporting devices formed on the walls of the inner or outer portions of the vessel or by means attached to the said blocks.

What I claim is a 1. A vacuum insulated vessel having its inner and outer portions connected at the mouth of the vessel, and a stiffenin device interposed between the vertical wal s of the inner and outer portions of the vessel for 'spacingthem apart at a distance from the mouth of the vessel, said device being supported in position whollv by its frictional contact with the walls of the vessel.

2. A vacuum insulated vessel having its inner and outer portions connected at the mouth of the vessel'and a stiii'enin device interposed between the vertical walls of the inner and outer.- portions of the vessel for spacing them apart at a distance from the mouth of the vessel, said device comprising a plurality of yielding spacingblocks compressed between and supported wholly by their frictional contact with the walls of the said vessel.

3. A vacuum insulated vessel having its inner and outer portions connected at the mouth of the vessel and 'a stiffening device interposed between the vertical walls of the inner and outer portions of the vessel for spacing them apart at a distance from the mouth of the vessel, said device comprising a ring and a plurality of yielding spacing blocks thereon compressed between and supported, wholly by their frictional contact with the walls of the vessel.

In testimony, that I claim the foregoing as my invention, 1 have signed my name in presence of two witnesses, this 12th day of 

